a(n) = Sum_{k=0..n} Stirling1(n,k) * (n!/k!)^2.

A385752

a(n) = Sum_{k=0..n} Stirling1(n,k) * (n!/k!)^2.

Terms

    a(0) =1a(1) =1a(2) =-3a(3) =46a(4) =-1967a(5) =179351a(6) =-29861639a(7) =8200834972

External references